...But if some IF-STRstacking walking abrams tank is rolling into your direction there is simply no point in fighting...
Yep, and it should be this way. What the game is missing is that abrams tanks are also impervious to arrows.
And to your comment about making greatswords 5 slots: I would support making them 3 slots, so you can't bring another big two handed weapon with you. Maybe the longest could even be 4 slots.
I understand that making all quivers 2 slots comes off as a bit extreme, but if you think about it, you'll see that after having shot all their arrows, archers would be useless UNLESS they used some kind of melee weapon (which is exactly the goal). And yeah, if you take a long/warbow, then you can't use a melee weapon. Too bad. You can pick one up or use one of the 0 slot weapons.